172731761 has 2 divisors, whose sum is σ = 172731762. Its totient is φ = 172731760.

The previous prime is 172731749. The next prime is 172731787. The reversal of 172731761 is 167137271.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 135582736 + 37149025 = 11644^2 + 6095^2 .

It is a cyclic number.

It is not a de Polignac number, because 172731761 - 2¹⁰ = 172730737 is a prime.

It is a super-2 number, since 2×172731761² = 59672522516322242, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (172731701) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 86365880 + 86365881.

It is an arithmetic number, because the mean of its divisors is an integer number (86365881).

Almost surely, 2^172731761 is an apocalyptic number.

It is an amenable number.

172731761 is a deficient number, since it is larger than the sum of its proper divisors (1).

172731761 is an equidigital number, since it uses as much as digits as its factorization.

172731761 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 12348, while the sum is 35.

The square root of 172731761 is about 13142.7455655202. The cubic root of 172731761 is about 556.9173315421.

The spelling of 172731761 in words is "one hundred seventy-two million, seven hundred thirty-one thousand, seven hundred sixty-one".